ShoreFlex’s vegetated concrete block erosion control mat is an erosion control mattress that can be unrolled over a soil surface to protect the subgrade from erosion. These rolled concrete block mats consist of concrete blocks cast into a geosynthetic netting with varied materials as a backing. Erosion control testing of the concrete block mats was performed on a variable slope flume with flow capabilities up to 25 cubic feet per second and slopes from 0 to 30%.  Four different types of backing materials were provided by the manufacturer and were tested against each other with the objective of producing a hydraulic condition threshold such that the mats can operate effectively. Each mat was tested until the underlying soil subgrade experienced significant erosion, data gathered from these tests were analyzed and a velocity and shear stress threshold were produced for each of the mats. During the analysis of the data produced from these tests, insufficiencies were noticed in the industry standard method of analysis prompting additional research into the analysis of erosion control mats of every kind.